Answer:
D. [tex]A\subset \mathbb{R}\times\mathbb{R}.[/tex]
Step-by-step explanation:
Consider the set
[tex]A=\left\{(2,3),\ (5,1),\ (-3,-2),\ (0,3)\right\}[/tex]
This set consists of four ordered pairs.
The first numbers in these pairs are [tex]2,\ 5,\ -3,\ 0.[/tex] These numbers are integer numbers (not natural, because -3 is negative).
The second numbers in these pairs are [tex]3,\ 1,\ -2,\ 3.[/tex] These numbers are integer numbers too (not natural, because -2 is negative).
Options contain only natural and real sets, so, the first and the second numbers are real numbers and
[tex]A\subset \mathbb{R}\times\mathbb{R}.[/tex]
